noun
basic rock
Geological term for igneous rock with a relatively low silica content, typically rich in magnesium and iron.
玄武岩は代表的な塩基性岩の一つです。
Basalt is one of the typical basic rocks.
Acidic rock, with high silica content; contrasts with 塩基性岩 in geological classification.
Compound of 塩基性 (basic, alkaline) + 岩 (rock). The term is a direct translation of the English geological term 'basic rock'.